The air cond has been switching from normal air out the vents to the defrost and then after you are sweating it goes back to normal? Its a 95 Eldorado. I have the factory manuals for a 96 (missed out on the bid for the 95)and now I understand why it cost so much for the dealer to fix something. The factory does not give them a good check source. Hope some one has a good start point to check! Before the wife takes my truck!!
Thanks
Duke

Im having the same problem, someone told me they thought it was the vacuum resovoir
which i promptly putchased, and begin looking for the location of, this illusive black plastic ball with two vacuum hose connections, needless to say im still looking for it ? Can anyone help me with location of said reservoir?